CN114267894A - Method for judging aging time of lithium ion battery - Google Patents
Method for judging aging time of lithium ion battery Download PDFInfo
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- CN114267894A CN114267894A CN202111586588.XA CN202111586588A CN114267894A CN 114267894 A CN114267894 A CN 114267894A CN 202111586588 A CN202111586588 A CN 202111586588A CN 114267894 A CN114267894 A CN 114267894A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a method for judging the aging time of a lithium ion battery, which comprises the following steps: dividing the electric cores into a plurality of groups and marking the groups; injecting liquid into the electric core to ensure that the positive and negative pole pieces can be completely soaked in the liquid injection amount of the electric core; fixing the minimum aging time, aging and placing the battery cores after liquid injection for different times according to the grouping in advance, and gradually prolonging the aging time from 1-N groups; the method is a simple and easy judgment mode of the aging time of the lithium ion battery.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a method for judging the aging time of a lithium ion battery.
Background
In recent years, with the exhaustion of fossil energy and the increasing serious problem of environmental pollution, new energy industries are paid attention by governments of various countries in the world, and the electric hot tide of automobiles is raised all over the world. The lithium ion battery has the advantages of high energy density, high power, long service life, no memory effect and the like, so that the lithium ion battery becomes a research hotspot in the world nowadays, and the performance of the lithium ion battery serving as the heart of a new energy electric vehicle directly influences the popularization and application of the electric vehicle.
The soft package lithium battery has the advantages of high energy density, flexible size design, high safety and the like, and occupies higher and higher amount in the market. The production process of the soft package lithium battery comprises the processes of homogenizing, coating, rolling, die cutting, winding or laminating, tab welding, packaging, injecting liquid, forming and the like, and an aging and standing process is carried out after injecting liquid so as to fully soak the electrolyte in the pole piece. If the aging time is too short, the pole piece is not fully soaked, so that the capacity of the anode and cathode materials is not well exerted in the later period, the internal resistance is too large, lithium is separated seriously, and safety accidents are caused; if the aging time is too long, the production efficiency is reduced, and the product cost is increased.
Disclosure of Invention
Therefore, the invention aims to provide a method for judging the aging time of a lithium ion battery, which can simply, quickly and effectively judge the optimal aging time.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for judging the aging time of a lithium ion battery comprises the following steps:
(1) firstly, dividing qualified production cells into a plurality of groups, and marking by 1-N;
(2) injecting liquid into the relevant electric core, ensuring that the positive and negative pole pieces can be completely soaked in the injection amount of the electric core, and placing the electric core after liquid injection into a high-temperature environment for aging;
(3) fixing the minimum aging time, aging and placing the battery cores after liquid injection at different intervals according to the grouping in advance, and gradually prolonging the aging time from 1-N groups;
(4) disassembling the battery core meeting the requirement of the aging time, selecting the positive pole and the negative pole at the middle part, drying, testing the adhesion of the pole pieces, and acquiring and recording the tension data;
(5) and determining the optimal aging time of the battery cell after liquid injection according to the adhesive force variation trend of the positive and negative pole pieces.
Preferably, the high-temperature environment in the step (2) is 40-60 ℃;
as a preferable mode, the minimum aging time in the step (3) is 1 h;
as a preferable mode, the interval time in the step (3) is 2 to 4 hours;
as a preferable mode, in the step (4), the drying temperature is 35-55 ℃, the vacuum degree is more than or equal to-85 kPa, and the drying time is 0.5-1 h.
The invention has the beneficial effects that: the aging time is judged by adopting the change of the pole piece adhesion force after the lithium ion battery is injected, the relevance of the pole piece adhesion force and the electrolyte infiltration in the battery core is utilized, when the pole piece is completely infiltrated by the electrolyte, the pole piece can be contacted with the current collector, the current collector is slightly corroded, the adhesive swells, so that the adhesion force of the pole piece and the current collector is changed, the variation of the adhesion force of the positive pole piece and the negative pole piece is gradually reduced along with the extension of the infiltration time, and when the adhesion force curve is basically kept horizontal after the electrolyte is completely infiltrated, the optimal aging time is obtained.
Drawings
Fig. 1 is a graph showing the change of the adhesion of the positive plate at different aging times of the battery cell in example 1 of the present invention;
fig. 2 is a graph showing the change of the adhesion of the negative electrode plate in different aging times of the battery cell in example 1 of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
The method for judging the aging time of the lithium ion battery comprises the following steps:
(1) firstly, dividing qualified cells to be produced into 8 groups, wherein each group comprises 2 cells, and marking;
(2) injecting liquid into the marked battery cell, ensuring that the positive and negative pole pieces can be completely soaked in the injection amount of the battery cell, and placing the battery cell after the liquid injection into an environment at 60 ℃ for aging;
(3) fixing 1h of aging time, aging and placing the battery cores after liquid injection at intervals of 4h according to the pre-grouping, and gradually prolonging the aging time from 1-8 groups;
(4) disassembling the battery cell meeting the requirement of the aging time, and baking the positive plate and the negative plate at the middle part in a baking oven at 55 ℃ and the vacuum degree of more than or equal to-85 kPa for 0.5 h;
(5) and testing the adhesion force of the pole pieces, acquiring and recording tensile force data, and determining the optimal aging time of the battery cell after liquid injection according to the adhesive force variation trend of the positive and negative pole pieces.
The test results are shown in fig. 1 and 2. Under the condition, the adhesion force of the positive electrode of the battery cell from the 7 th group of test battery cells is basically not changed, the curve keeps horizontal, and the soaking time of the electrolyte is about 25 hours; similarly, the soaking time of the cell cathode electrolyte is about 20h
Example 2
The method for judging the aging time of the lithium ion battery comprises the following steps:
(1) firstly, dividing qualified cells to be produced into 11 groups, wherein each group comprises 2 cells, and marking;
(2) injecting liquid into the marked battery cell, ensuring that the positive and negative pole pieces can be completely soaked in the injection amount of the battery cell, and placing the battery cell after the liquid injection into an environment at 40 ℃ for aging;
(3) fixing 1h of aging time, aging and placing the battery cores after liquid injection at intervals of 2h according to the pre-grouping, and gradually prolonging the aging time from 1-11 groups;
(4) disassembling the battery cell meeting the requirement of the aging time, and baking the anode and cathode plates at the middle part for 1h in a baking oven at the temperature of 35 ℃ and the vacuum degree of more than or equal to-85 kPa;
(5) and testing the adhesion force of the pole pieces, acquiring and recording tensile force data, and determining the optimal aging time of the battery cell after liquid injection according to the adhesive force variation trend of the positive and negative pole pieces.
From the test results, the soaking time of the electrolyte of the positive electrode of the battery cell is about 25 hours and the soaking time of the electrolyte of the negative electrode of the battery cell is about 20 hours at the environmental temperature of 60 ℃, and the test results are basically consistent with the aging time of the battery cell which passes the electrochemical test (the aging time of the internal resistance test is about 28 hours at 45 ℃), which also indicates that the test method of the invention can better and effectively judge the aging time of the lithium ion battery.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A method for judging the aging time of a lithium ion battery is characterized by comprising the following steps:
(1) firstly, dividing qualified production cells into a plurality of groups, and marking by 1-N;
(2) injecting liquid into the relevant electric core, ensuring that the positive and negative pole pieces can be completely soaked in the injection amount of the electric core, and placing the electric core after liquid injection into a high-temperature environment for aging;
(3) fixing the minimum aging time, aging and placing the battery cores after liquid injection at different intervals according to the grouping in advance, and gradually prolonging the aging time from 1-N groups;
(4) disassembling the battery core meeting the requirement of the aging time, selecting the positive pole and the negative pole at the middle part, drying, testing the adhesion of the pole pieces, and acquiring and recording the tension data;
(5) along with the extension of the infiltration time, the variation of the adhesive force of the positive and negative pole pieces is gradually reduced, and when the swelling of the adhesive contacting with the current collector is complete, the adhesive force curve is basically kept horizontal, so that the optimal aging time is obtained.
2. A method for determining aging time of a lithium ion battery according to claim 1, characterized in that: the high-temperature environment in the step (2) is 40-60 ℃.
3. A method for determining aging time of a lithium ion battery according to claim 1, characterized in that: and (3) the minimum aging time is 1 h.
4. A method for determining aging time of a lithium ion battery according to claim 1, characterized in that: the interval time in the step (3) is 2-4 h.
5. A method for determining aging time of a lithium ion battery according to claim 1, characterized in that: in the step (4), the drying temperature is 35-55 ℃, the vacuum degree is more than or equal to-85 kPa, and the drying time is 0.5-1 h.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2008144968A1 (en) * | 2007-05-28 | 2008-12-04 | Dongguan Amperex Electronics Technology Co. , Ltd, | Method of laminated lithium ion battery |
| JP2014203680A (en) * | 2013-04-05 | 2014-10-27 | 日本ゼオン株式会社 | Slurry for secondary battery porous film, porous film for secondary battery, manufacturing method thereof, and application |
| CN107369862A (en) * | 2017-08-04 | 2017-11-21 | 东莞市振华新能源科技有限公司 | A kind of method of testing of lithium ion battery digestion time |
| CN111403749A (en) * | 2020-06-03 | 2020-07-10 | 江苏时代新能源科技有限公司 | Lithium ion battery and device thereof |
| CN111403801A (en) * | 2020-03-23 | 2020-07-10 | 孚能科技(赣州)股份有限公司 | Lithium ion battery and preparation method thereof |
| CN112649739A (en) * | 2020-12-22 | 2021-04-13 | 惠州亿纬创能电池有限公司 | Method and device for determining standing time after battery liquid injection |
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2021
- 2021-12-23 CN CN202111586588.XA patent/CN114267894B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008144968A1 (en) * | 2007-05-28 | 2008-12-04 | Dongguan Amperex Electronics Technology Co. , Ltd, | Method of laminated lithium ion battery |
| JP2014203680A (en) * | 2013-04-05 | 2014-10-27 | 日本ゼオン株式会社 | Slurry for secondary battery porous film, porous film for secondary battery, manufacturing method thereof, and application |
| CN107369862A (en) * | 2017-08-04 | 2017-11-21 | 东莞市振华新能源科技有限公司 | A kind of method of testing of lithium ion battery digestion time |
| CN111403801A (en) * | 2020-03-23 | 2020-07-10 | 孚能科技(赣州)股份有限公司 | Lithium ion battery and preparation method thereof |
| CN111403749A (en) * | 2020-06-03 | 2020-07-10 | 江苏时代新能源科技有限公司 | Lithium ion battery and device thereof |
| CN112649739A (en) * | 2020-12-22 | 2021-04-13 | 惠州亿纬创能电池有限公司 | Method and device for determining standing time after battery liquid injection |
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